[Core feature] Flyteadmin notifications: use webhooks APIs

[katrogan]

Motivation: Why do you think this is important?

Currently flyteadmin notifications are delivered using the PagerDuty, Github and Slack email APIs. On AWS deployments FlyteAdmin uses SES to trigger emails, for all others the only alternative email implementation is SendGrid integration.

Setting up SES or SendGrid can be somewhat complicated. Furthermore, asking your Flyte users to configure the aforementioned services with email integrations adds even more overhead. It would be simpler as an alternative to provide webhook integration for notification so that users only have to configure existing API keys for PagerDuty/Github/Slack

Goal: What should the final outcome look like, ideally?

Setting up a flyteadmin deployment to send notifications should require simple configuration.

Describe alternatives you've considered

The current email API integration. We could introduce other email integrations to increase the accessibility of notifications.

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[flixr]

We are running flyte on-prem, and hence cannot use any of the existing notifications.
Webhooks would indeed be very nice, then we could just post it in our mattermost channel.

[BroderPeters]

We would also love to have more flexibility in the notification setup 👍🏻

[github-actions]

Hello 👋, this issue has been inactive for over 9 months. To help maintain a clean and focused backlog, we'll be marking this issue as stale and will engage on it to decide if it is still applicable.
Thank you for your contribution and understanding! 🙏

[marrrcin]

It's crazy that we're in 2025 and the only option is still sending emails, which - as the author of this issue stated:

Setting up SES or SendGrid can be somewhat complicated

I totally agree on! There is a lot of overhead with domain verifications and so on, just to send a piece of text.

At least support for Slack webhooks would be nice 🙄
https://api.slack.com/messaging/webhooks